/* * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */#ifndef SHARE_VM_GC_SHARED_SOFTREFPOLICY_HPP#define SHARE_VM_GC_SHARED_SOFTREFPOLICY_HPP#include "memory/allocation.hpp"class SoftRefPolicy { private: // Set to true when policy wants soft refs cleared. // Reset to false by gc after it clears all soft refs. bool _should_clear_all_soft_refs; // Set to true by the GC if the just-completed gc cleared all // softrefs. This is set to true whenever a gc clears all softrefs, and // set to false each time gc returns to the mutator. For example, in the // ParallelScavengeHeap case the latter would be done toward the end of // mem_allocate() where it returns op.result() bool _all_soft_refs_clear; public: SoftRefPolicy(); bool should_clear_all_soft_refs() { return _should_clear_all_soft_refs; } void set_should_clear_all_soft_refs(bool v) { _should_clear_all_soft_refs = v; } // Returns the current value of _should_clear_all_soft_refs. // _should_clear_all_soft_refs is set to false as a side effect. bool use_should_clear_all_soft_refs(bool v); bool all_soft_refs_clear() { return _all_soft_refs_clear; } void set_all_soft_refs_clear(bool v) { _all_soft_refs_clear = v; } // Called by the GC after Soft Refs have been cleared to indicate // that the request in _should_clear_all_soft_refs has been fulfilled. virtual void cleared_all_soft_refs();};class ClearedAllSoftRefs : public StackObj { bool _clear_all_soft_refs; SoftRefPolicy* _soft_ref_policy; public: ClearedAllSoftRefs(bool clear_all_soft_refs, SoftRefPolicy* soft_ref_policy) : _clear_all_soft_refs(clear_all_soft_refs), _soft_ref_policy(soft_ref_policy) {} ~ClearedAllSoftRefs() { if (_clear_all_soft_refs) { _soft_ref_policy->cleared_all_soft_refs(); } } bool should_clear() { return _clear_all_soft_refs; }};#endif // SHARE_VM_GC_SHARED_SOFTREFPOLICY_HPP